CN100452450C - Optical surface mount technology package - Google Patents

Optical surface mount technology package Download PDF

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Publication number
CN100452450C
CN100452450C CNB200510005131XA CN200510005131A CN100452450C CN 100452450 C CN100452450 C CN 100452450C CN B200510005131X A CNB200510005131X A CN B200510005131XA CN 200510005131 A CN200510005131 A CN 200510005131A CN 100452450 C CN100452450 C CN 100452450C
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CN
China
Prior art keywords
tube core
packaging part
cofferdam
optics
package substrate
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Expired - Fee Related
Application number
CNB200510005131XA
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Chinese (zh)
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CN1694270A (en
Inventor
罗伯特·E·威尔逊
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Avago Technologies International Sales Pte Ltd
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Agilent Technologies Inc
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Publication of CN1694270A publication Critical patent/CN1694270A/en
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Publication of CN100452450C publication Critical patent/CN100452450C/en
Expired - Fee Related legal-status Critical Current
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  • Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)

Abstract

A semiconductor package includes a package substrate, an optical device die atop the package substrate, a transparent optical element atop the die, an optional dam around the die, and an encapsulant entirely covering the die and partially covering the transparent optical element.

Description

Optical surface mount technology package
Technical field
The present invention relates to the surface mounting technology packaging part, more specifically, relate to the surface mounting technology packaging part of optics.
Background technology
Surface mounting technology (SMT) packaging part that is used for optics has obtained application in fiberoptics (FO).Have now much be used for such as the non-optical device of silicon integrated circuit (IC) at the available SMT packaging part of industry.Selectablely comprise mold leaded packaging part, ceramic ball grid array (BGA), lamination (laminate) BGA and many other selections in epoxy resin.These IC packaging parts can be thermal-enhanced, how chip-shaped, low-cost types or the like.But there is not so abundant optics SMT packaging part.
One of inexpensive method of encapsulation IC is a chip on board (COB) as shown in Figure 1.Tube core 12 is directly mounted on the printed circuit board (PCB) (PCB) 14, and bonding wire 16 carries out being connected between the trace on trace and the PCB 14 on the tube core 12.As shown in Figure 2, by providing environmental protection with opaque epoxy resin 18 covering devices that are called " dripping Jiao Gai (globtop) ".For the thermal coefficient of expansion (CTE) that reduces epoxy resin 18 so that thermal cycle does not make bonding wire stress excessive, the epoxy resin that becomes to drip is by in large quantities with the material " filling " that has with PCB 14 similar CTE.Because packing material (often being silicon dioxide) is also opaque, so COB 10 can not be used for optics usually.What therefore, need is the SMT packaging part that is used for optics.
Summary of the invention
In one embodiment of the invention, semiconductor package part comprise package substrate, the optics tube core on the package substrate end face, on the tube core end face transparent optical element, around the optics cofferdam of tube core and cover tube core fully and partly cover the sealant of transparent optical element.
Description of drawings
Fig. 1 and Fig. 2 illustrate traditional chip on board packaging part.
Fig. 3 and Fig. 4 illustrate the packaging part that is used for optics in the one embodiment of the invention.
Fig. 5 and Fig. 6 illustrate the packaging part that is used for optics in the another embodiment of the present invention.
Fig. 7, Fig. 8 and Fig. 9 illustrate the packaging part that is used for optics in the another embodiment of the present invention.
Figure 10 and Figure 11 illustrate the packaging part that is used for optics in the another embodiment of the present invention.
Figure 12 illustrates the method for an embodiment of tamper seal piece installing during the assembling process in one embodiment of the invention.
Use the identical similar or components identical of reference number indication in the different accompanying drawings.
Embodiment
Fig. 3 and Fig. 4 illustrate the surface mounting technology that is used for optics (SMT) packaging part 20 in the one embodiment of the invention.Tube core 22 is installed on the package substrate 24.Tube core 22 comprises the optics such as Vcsel (VCSEL), light-emitting diode (LED) or photodiode.Package substrate 24 can be printed circuit board (PCB) (PCB) or ceramic substrate.The bottom surface of package substrate 24 can provide ball grid array (BGA) 29, to be electrically connected on another substrate (for example, user PCB).Trace on the tube core 22 is connected to trace on the package substrate 24 by bonding wire 26.
Transparent optical element 27 is installed on the tube core 22, passes the window of " dripping Jiao Gai " with establishment, and this Jiao Gai forms by deposition sealant 28 on package substrate 24.In one embodiment, window 27 is rectangle glass or quartz plate, and sealant 28 is that the epoxy resin that is used to provide with the material of the similar thermal coefficient of expansion (CTE) of package substrate 24 is provided.The transparency of the requirement of window 27 is according to using defined (for example, 10% to 100%).In one embodiment, window 27 is the lens of direct light, the filter of light that sees through certain wavelength or their combination.For the protection on the environment, sealant 28 is deposited on the package substrate 24, to cover tube core 22 fully and partly to cover window 27.Window 27 is partly covered, and its end face does not have sealant 28, makes light to penetrate or to enter tube core 22 from tube core 22.
Fig. 5 and Fig. 6 illustrate the SMT packaging part 30 that is used for optics in the one embodiment of the invention.Be similar to packaging part 20, packaging part 30 comprises tube core 22, package substrate 24, bonding wire 26 and window 27.Packaging part 30 also is included in and centers on the cofferdam 33 that tube core 22, bonding wire 26 and window 27 form on the package substrate 24.Cofferdam 33 has the height higher than tube core 22, so that it can be filled for sealed dose 38 to cover tube core 22 fully and partly cover window 27.This has produced a Jiao Gai of the substantially flat with the window 27 that protrudes slightly.In one embodiment, sealant 38 is similar to sealant 28.Go out as shown, cofferdam 33 is generally the shape of the rectangle with fillet, but other shapes also can be used to surround the parts of wanting sealed dose 38 protection.In one embodiment, cofferdam 33 is a kind of epoxy resin, and this epoxy resin has desirable viscosity and mobile to form the wall (for example, thixotropic loop epoxy resins) in cofferdam.
Packaging part 30 has some advantages.At first, because the volume of material is limited in the cofferdam 33, so its amount of control institute sealant dispensed 38 easily.Secondly, cofferdam 33 has produced the smooth Jiao Gai that drips, and it is easy to utilize in the conventional fabrication processes employed vacuum pick head to operate.
Fig. 7, Fig. 8 and Fig. 9 illustrate the SMT packaging part 40 that is used for optics in the one embodiment of the invention.Packaging part 40 is similar to packaging part 30.Packaging part 40 comprises and has a plurality of optics that () tube core 42A for example, four VCSEL is to replace tube core 22.In addition, packaging part 40 comprises another tube core 42B, and this tube core 42B has the driver IC that is used for these optics.Tube core 42A is connected by bonding wire 46A with trace on the 42B, and tube core 42B is connected by bonding wire 46B with trace on the package substrate 44.For example, packaging part 40 has comprised one four channels transmit device, and transmitter driver IC is included in the packaging part.As can be seen, on tube core 42A end face, bigger window 47 has been installed.Cofferdam 43 is around tube core 42A, tube core 42B, bonding wire 46A and bonding wire 46B.Sealant 48 is filled cofferdam 43, covering tube core 42A, tube core 42B, bonding wire 46A and bonding wire 46B fully, and partly covers window 47.The bottom of package substrate 44 can provide BGA 49, to be electrically connected to another substrate (for example, user PCB).
Figure 10 and Figure 11 illustrate the SMT packaging part 50 that is used for optics in the one embodiment of the invention.Packaging part 50 is similar to packaging part 40, except window 47 has been replaced by a plurality of lens 57 (for clear, only having marked) that are used for each optics.In one embodiment, each all is to be installed in the hyaloplasmic sphere lens above corresponding optical devices on the tube core 42A end face for lens 57, is directed to corresponding optical devices with guiding from the light of corresponding optical devices or with light.
If any one (for example, packaging part 50) that Figure 12 illustrates in the above-mentioned packaging part need be protected during assembling process, then the top of packaging part can cover with a slice belt 90.
Various other modifications of the feature of the disclosed embodiments and combination are all within the scope of the present invention.Claims have comprised many embodiment.

Claims (22)

1. semiconductor package part comprises:
Package substrate;
Tube core on described package substrate end face, described tube core comprises optics;
Transparent optical element on described tube core end face; With
Cover the sealant that described tube core also partly covers described transparent optical element fully.
2. packaging part according to claim 1, wherein, described transparent optical element is selected from filter and lens.
3. packaging part according to claim 2, wherein, described lens are selected from rectangular lens and globe lens.
4. packaging part according to claim 1 also comprises the cofferdam around described tube core, and wherein, described sealant is deposited within the described cofferdam.
5. packaging part according to claim 4, wherein, described cofferdam comprises the thixotropic loop epoxy resins.
6. packaging part according to claim 4, wherein, described cofferdam is the rectangle with fillet.
7. packaging part according to claim 4, wherein, described optics is selected from laser, light-emitting diode and photodiode.
8. packaging part according to claim 7 also comprises another tube core that is positioned at inside, described cofferdam and is covered by described sealant, and described another tube core comprises the circuit that drives described optics.
9. packaging part according to claim 1, wherein, described package substrate is selected from printed circuit board (PCB) and ceramic substrate.
10. packaging part according to claim 1, wherein, described package substrate comprises the ball grid array that is on the bottom surface.
11. packaging part according to claim 1, wherein, described tube core comprises the array of optics.
12. a method that is used to make semiconductor package part comprises:
On the package substrate end face tube core is installed, described tube core comprises optics;
On described tube core end face, transparent optical element is installed; And
The deposition sealant is to cover described tube core fully and partly to cover described transparent optical element.
13. method according to claim 12, wherein, described transparent optical element is selected from filter and lens.
14. method according to claim 13, wherein, described lens are selected from rectangular lens and globe lens.
15. method according to claim 12 also is included in before the operation of described deposition sealant, forms the cofferdam around described tube core, wherein, described sealant is deposited within the described cofferdam.
16. method according to claim 15, wherein, described cofferdam comprises the thixotropic loop epoxy resins.
17. method according to claim 15, wherein, the operation in described formation cofferdam comprises that formation has the rectangle cofferdam of fillet.
18. method according to claim 15, wherein, described optics is selected from laser, light-emitting diode and photodiode.
19. method according to claim 18, also be included in before the operation of described deposition sealant, another tube core is installed on described package substrate, described another tube core comprises the circuit that drives described optics, wherein, described cofferdam is around described tube core and described another tube core, and described sealant covers described tube core and described another tube core.
20. method according to claim 12, wherein, described package substrate is selected from printed circuit board (PCB) and ceramic substrate.
21. method according to claim 12, wherein, described package substrate comprises the ball grid array that is on the bottom surface.
22. method according to claim 12, wherein, described tube core comprises the array of optics.
CNB200510005131XA 2004-05-06 2005-01-28 Optical surface mount technology package Expired - Fee Related CN100452450C (en)

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US20050248008A1 (en) 2005-11-10
GB2413896A (en) 2005-11-09

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